linux-kernel - Re: [PATCH] hwmon: (nct7904) Fix the incorrect value of tcpu_mask in nct7904

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Date:   Wed, 5 Jun 2019 13:53:25 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Amy.Shih@...antech.com.tw
Cc:     she90122@...il.com, oakley.ding@...antech.com.tw,
        jia.sui@...antech.com.cn, Jean Delvare <jdelvare@...e.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (nct7904) Fix the incorrect value of tcpu_mask in
 nct7904_data struct.

On Fri, May 31, 2019 at 10:20:47AM +0000, Amy.Shih@...antech.com.tw wrote:
> From: "amy.shih" <amy.shih@...antech.com.tw>
> 
> Detect the multi-function of voltage, thermal diode and thermistor
> from register VT_ADC_MD_REG to set value of tcpu_mask in nct7904_data
> struct, set temp[1-5]_input the input values TEMP_CH1~4 and LTD of
> temperature. Set temp[6~13]_input the input values of DTS temperature
> that correspond to sensors TCPU1~8.
> 
Applied.

Thanks,
Guenter

> Signed-off-by: amy.shih <amy.shih@...antech.com.tw>
> ---
>  drivers/hwmon/nct7904.c | 72 +++++++++++++++++++++++++++++++++++------
>  1 file changed, 63 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
> index 04516789b070..6a74df6841f0 100644
> --- a/drivers/hwmon/nct7904.c
> +++ b/drivers/hwmon/nct7904.c
> @@ -4,6 +4,9 @@
>   * Copyright (c) 2015 Kontron
>   * Author: Vadim V. Vlasov <vvlasov@....rtsoft.ru>
>   *
> + * Copyright (c) 2019 Advantech
> + * Author: Amy.Shih <amy.shih@...antech.com.tw>
> + *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License as published by
>   * the Free Software Foundation; either version 2 of the License, or
> @@ -59,6 +62,8 @@
>  #define T_CPU1_HV_REG		0xA0	/* Bank 0; 2 regs (HV/LV) per sensor */
>  
>  #define PRTS_REG		0x03	/* Bank 2 */
> +#define PFE_REG			0x00	/* Bank 2; PECI Function Enable */
> +#define TSI_CTRL_REG		0x50	/* Bank 2; TSI Control Register */
>  #define FANCTL1_FMR_REG		0x00	/* Bank 3; 1 reg per channel */
>  #define FANCTL1_OUT_REG		0x10	/* Bank 3; 1 reg per channel */
>  
> @@ -74,6 +79,8 @@ struct nct7904_data {
>  	u32 vsen_mask;
>  	u32 tcpu_mask;
>  	u8 fan_mode[FANCTL_MAX];
> +	u8 enable_dts;
> +	u8 has_dts;
>  };
>  
>  /* Access functions */
> @@ -238,11 +245,15 @@ static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
>  
>  	switch (attr) {
>  	case hwmon_temp_input:
> -		if (channel == 0)
> +		if (channel == 4)
>  			ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
> +		else if (channel < 5)
> +			ret = nct7904_read_reg16(data, BANK_0,
> +						 TEMP_CH1_HV_REG + channel * 4);
>  		else
>  			ret = nct7904_read_reg16(data, BANK_0,
> -					T_CPU1_HV_REG + (channel - 1) * 2);
> +						 T_CPU1_HV_REG + (channel - 5)
> +						 * 2);
>  		if (ret < 0)
>  			return ret;
>  		temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
> @@ -258,11 +269,11 @@ static umode_t nct7904_temp_is_visible(const void *_data, u32 attr, int channel)
>  	const struct nct7904_data *data = _data;
>  
>  	if (attr == hwmon_temp_input) {
> -		if (channel == 0) {
> -			if (data->vsen_mask & BIT(17))
> +		if (channel < 5) {
> +			if (data->tcpu_mask & BIT(channel))
>  				return 0444;
>  		} else {
> -			if (data->tcpu_mask & BIT(channel - 1))
> +			if (data->has_dts & BIT(channel - 5))
>  				return 0444;
>  		}
>  	}
> @@ -469,6 +480,7 @@ static int nct7904_probe(struct i2c_client *client,
>  	struct device *dev = &client->dev;
>  	int ret, i;
>  	u32 mask;
> +	u8 val, bit;
>  
>  	data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL);
>  	if (!data)
> @@ -502,10 +514,52 @@ static int nct7904_probe(struct i2c_client *client,
>  	data->vsen_mask = mask;
>  
>  	/* CPU_TEMP attributes */
> -	ret = nct7904_read_reg16(data, BANK_0, DTS_T_CTRL0_REG);
> -	if (ret < 0)
> -		return ret;
> -	data->tcpu_mask = ((ret >> 8) & 0xf) | ((ret & 0xf) << 4);
> +	ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL0_REG);
> +
> +	if ((ret & 0x6) == 0x6)
> +		data->tcpu_mask |= 1; /* TR1 */
> +	if ((ret & 0x18) == 0x18)
> +		data->tcpu_mask |= 2; /* TR2 */
> +	if ((ret & 0x20) == 0x20)
> +		data->tcpu_mask |= 4; /* TR3 */
> +	if ((ret & 0x80) == 0x80)
> +		data->tcpu_mask |= 8; /* TR4 */
> +
> +	/* LTD */
> +	ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
> +	if ((ret & 0x02) == 0x02)
> +		data->tcpu_mask |= 0x10;
> +
> +	/* Multi-Function detecting for Volt and TR/TD */
> +	ret = nct7904_read_reg(data, BANK_0, VT_ADC_MD_REG);
> +
> +	for (i = 0; i < 4; i++) {
> +		val = (ret & (0x03 << i)) >> (i * 2);
> +		bit = (1 << i);
> +		if (val == 0)
> +			data->tcpu_mask &= ~bit;
> +	}
> +
> +	/* PECI */
> +	ret = nct7904_read_reg(data, BANK_2, PFE_REG);
> +	if (ret & 0x80) {
> +		data->enable_dts = 1; //Enable DTS & PECI
> +	} else {
> +		ret = nct7904_read_reg(data, BANK_2, TSI_CTRL_REG);
> +		if (ret & 0x80)
> +			data->enable_dts = 0x3; //Enable DTS & TSI
> +	}
> +
> +	/* Check DTS enable status */
> +	if (data->enable_dts) {
> +		data->has_dts =
> +			nct7904_read_reg(data, BANK_0, DTS_T_CTRL0_REG) & 0xF;
> +		if (data->enable_dts & 0x2) {
> +			data->has_dts |=
> +			(nct7904_read_reg(data, BANK_0, DTS_T_CTRL1_REG) & 0xF)
> +								<< 4;
> +		}
> +	}
>  
>  	for (i = 0; i < FANCTL_MAX; i++) {
>  		ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i);